Problem may be with saaj.jar and AXIS,WAS,WSAD

I have successfully developed and deployed an EJB using WSAD 5.1.2's WebSphere 5.0 Test Environment. I have even able to access the EJB using UTC(Universal Test Client) in WSAD and by launching the j2ee client module using WebSphere lauchClient program.

I have now exposed this ejb as web service using AXIS 1.2 RC2 deployed as web module inside WSAD. This web service is properly exposed as web service as I can see it and access its wsdl when I access axis web services.

Now I have written a standalone-outside-wsad web service client that uses AXIS stubs and when I try to consume to this ejb web service I am getting below error.

(500)Internal Server Error at org.apache.axis.transport.http.HTTPSender.readFromSocket(HTTPSender.java:663) at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:94) at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32) at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118) at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83) at org.apache.axis.client.AxisClient.invoke(AxisClient.java:147) at org.apache.axis.client.Call.invokeEngine(Call.java:2719) at org.apache.axis.client.Call.invoke(Call.java:2702) at org.apache.axis.client.Call.invoke(Call.java:2378) at org.apache.axis.client.Call.invoke(Call.java:2301) at org.apache.axis.client.Call.invoke(Call.java:1758) at com.sosnoski.test.DemoBindingStub.getAccountHistory(DemoBindingStub.java:194) at com.sosnoski.test.Client.query(Client.java:63) at com.sosnoski.test.Client.main(Client.java:100)

I read somewhere with axis mailing lists that it is problem related to axis's saaj.jar and wsad's websphere 5.0 test environment's webservices.jar so I even replaced my wsad installation's D:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v5\lib\webservices.jar with saaj.jar but this did not help and even I have added an references to saaj.jar usign wsad's websphere 5.0 test environment environment tab->ws.ext.dirs property and even this did not help.

Can anyone please tell me why is error occurring and how to solve it ?